Craniocerebral CTA examination is to visualize the blood vessels in the brain after injecting contrast medium into the vein, and the specific observation method mainly depends on the developmental status of the blood vessels, the condition of the wall of the vessels, and whether they are accompanied by aneurysms. 1. Development of blood vessels: Craniocerebral CTA examination mainly observes the traveling condition of blood vessels, whether it is accompanied by developmental variations of blood vessels, whether it is accompanied by developmental malformations, and makes a comprehensive judgment on the overall condition of blood vessels. 2. Tube wall condition: mainly observe the tube wall traveling condition, whether there is tube wall thickening and stiffness, whether it is accompanied by plaque formation, and further observe the specific stenosis condition. 3. Whether it is accompanied by aneurysm: mainly observe whether it is accompanied by tube wall protrusion, and further determine whether there is aneurysm. If abnormal vascular conditions are detected through cranial CTA examination, it is necessary to consult a doctor in time and carry out standardized treatment under the guidance of clinicians.